title: Bose-Einstein condensation of semi-hard bosons in the S = 1 dimerized organic compound F(2)PNNNO.
abstract: An analysis of the energy spectrum and magnetization curve of the two-dimensional organic antiferromagnet F(2)PNNNO with a spin-one dimerized structure shows that the behavior of the compound in an external magnetic field can be explained within a lattice boson model with an extended Pauli exclusion principle, i.e. no more than two bosons per dimer. The unusual magnetization curve observed experimentally in the compound reflects a sequence of phase transitions intrinsic for a lattice boson system with strong on-site and inter-site repulsions due to a tuning of magnon density by the applied magnetic field.
authors.affiliation: Department of Physics, Ural State University, 620083, Ekaterinburg, Russia.
authors.forename: I G
authors.initials: IG
authors.lastname: Bostrem
authors.forename: V E
authors.initials: VE
authors.lastname: Sinitsyn
authors.forename: A S
authors.initials: AS
authors.lastname: Ovchinnikov
authors.forename: Y
authors.initials: Y
authors.lastname: Hosokoshi
authors.forename: K
authors.initials: K
authors.lastname: Inoue